HickUP is a small multi-platform system for managing applications for a user or project environment. The user can, through a GUI or command line tool, choose which applications and versions they want to use. The project manager can specify allowed applications and versions of these the project members can select. The user can then select one of multiple environments to use at login or within a specific shell.

PHPLOT is a PHP graphics class for creating charts and plots. It works with PHP5 (but older versions can use PHP4). PHPlot uses the PHP GD extension to produce PNG, GIF, or JPEG images. TrueType fonts (TTF) are optional, or built-in GD fonts can be used. The available plot types are: area, bars, line/points, lines, pie, points, squared, stacked-bars, and thin bar-line. Labels, tick marks, plot legend, X/Y axes, and more are all configurable. Images can be imported as a background, multiple graphs can be drawn on one image, and images can be saved to disk or returned to a browser.

The aim of SCEW is to provide an easy interface around the XML Expat parser, as well as a simple interface for creating new XML documents. It provides functions to load and access XML elements without the need to create Expat event handling routines every time you want to load a new XML document. It uses a DOM-like object model for new or parsed XML documents, supports loading concatenated XML documents, can copy and compare full XML documents, elements, or attributes, writes XML documents to multiple outputs, and allows adding new I/O sources easily. It supports UTF-8, ISO-8859-1, and US-ASCII encoding (and UTF-16 in Windows).

Open Tool Kit (Otk) is a portable widget library for making
graphical user interfaces for C programs. It
emphasizes simplicity for the application
programmer without eliminating capability. Based
on OpenGL, Otk supports Linux, Unix, and other OSs
neutrally and efficiently. It is simple and
compact, and it strives for easy compilation and
linking to other applications. In seeking to
address several issues associated with earlier
graphics APIs, Otk explores some interesting
methods, such as window-relative layout instead of
pixel-based layout.

Mapnik is a toolkit for developing GIS
applications. At the core is a C++ shared library
providing algorithms/patterns for spatial data
access and visualization. Essentially a collection
of geographic objects (map, layer, datasource,
feature, and geometry), the library doesn't rely
on "windowing systems" and can be deployed in any
server environment. It is intended to play fair in
a multi-threaded environment and is aimed
primarily, but not exclusively, at Web-based
development. High-level Python bindings
(boost.python) facilitate rapid application
development, targeting zope3, django, etc.

Qanava is a C++ library designed to display graphs
on a Qt canvas. Qanava provide classes to generate
various layouts of directed graphs and visualize
their nodes with custom styles on a graphic
canvas. Qanava is designed for applications with
basic graph visualization needs such as Gantt
charts, social networks, and document or network
modelling applications. It is not meant for a
complex interactive visualization of very large
data sets.

InteLib is a library of C++ classes that lets you do Lisp/Scheme programming within your C++ programs, even without any additional preprocessing, without all those calling conventions. You can write code that is accepted by a C++ compiler while thinking in a "Lisp/Scheme mode", and the code you write will look much like Lisp/Scheme code, although it will be pure C++.

liboping is a C library for measuring network
latency using ICMP echo requests. It can send to
and receive packets from multiple hosts in
parallel, which is nice for monitoring
applications. Both IPv4 and IPv6 are supported
transparently for the programmer and user. A
program called oping is included to show the
simplicity and potential of the library and
provide the functionality at the command line.

Mathomatic is a portable, general-purpose computer algebra system (CAS) that can solve, differentiate, simplify, combine, and compare algebraic equations, perform standard, complex number, modular, and polynomial arithmetic, etc. It does some calculus and is very easy to compile/install, learn, and use. The symbolic math application with a simple command-line interface is designed to be a colorful algebra calculator that is reliable, responsive, and convenient to use. The symbolic math library is lightweight and easy to include in other software, due to being written entirely in C with no additional dependencies.